Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c097bf2a0feef22…

MALICIOUS

PDF

74.1 KB Created: 2021-03-12 08:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a82026f18d473a6e51115bdf539b2ffa SHA-1: c2ad72269b2c2e2ae8ae580dfe02b72065a5978b SHA-256: 5c097bf2a0feef22173e990e7a9b946f5e52441acc0b4aee933c860cc44e76e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, possibly exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=chilton+repair+manual+free+pdf PDF link annotation
    • http://greatholl.com/2006_chevrolet_malibu_lt_sedan_4dp645o.pdfIn PDF document text
    • http://masalev.ru/96880920861dl7i0.pdfIn PDF document text
    • http://vir-tus.com/how_to_fix_jammed_gun_dayz_xboxv8lvk.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/ohgnCha/diversity_in_the_workplace.pdfIn PDF document text
    • https://cdn.sqhk.co/jegisizozul/OmiiLjf/xiwutivudigu.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/ydPkjco/bad_piggies_hd_apk_field_of_dreams.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hiheegf/video_player_app_download_apk.pdfIn PDF document text
    • http://stroymarketmetal.ru/tubujg1j9f.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/bJgeCse/coloring_animals_pixel_art_game_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/intro_to_econometrics_stock_and_watson.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/tamil_rockers_audio_songs_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/35655790422.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/icd_10_cm_code_for_former_smoker.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_26074b820e1f47aa83decb6da1f5dc0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/32185921007.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/42151691738.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/87797549474.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/wexazufexupobip.pdfIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_6b0e27cb5e8d49debf48f9b5dcd995b3.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_10701e338c0d4b53bd0c26f24fe0abfd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/pavapemegoxamomasamutak.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_4dcfca9678ea46d1939c3f52337b4b08.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 5008 bytes
SHA-256: 4ffa24427a53b4ebc9f7b11cc6c7541706e23176af3818a1232f592d952f7cd9
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10732 bytes
SHA-256: f5842089d8a3a548f9c2589b615bc5075415d52af6f93b5363e2d0ff87c074b5

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